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Microstructure of laser bent aluminium alloy alclad 2024-T3

机译：激光弯曲铝合金Alclad 2024-T3的微观结构

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A set of optical and SEM micrographs of the Aluminium Alloy AlcIad 2024-T3 microstructure, which has been bent by means of a CO{sub}2-laser beam, are presented showing the changes occurring to the grain structure as a consequence of this laser induced process. The laser bending variables used are: power (P), scanning velocity (v), beam diameter (D) and number of passes (N), all of them arranged into a parameter, （NS·p）/(D·v)called Accumulated Energy Density (AED in J/mm{sup}2). For AED values below 25 J/mm{sup}2 the microstructure of the material showed presence of subgrain structures and incomplete recrystallization of small size grains in the upper region of the sheet. Higher AED values, in between 25 and 133 J/mm{sup}2, caused recrystallization to take place fully, contrasting with the elongated crystal structure of the as-received material. In that AED range segregation of dispersoids at the grain boundaries occurred as well as partial melting of previously recrystallized grain. For AED values near to 133 J/mm{sup}2 melting and resolidification of the upper region of the sheet, underneath its Alclad layer, took place leaving a cellular-dendritic structure. AED values ranging from 133 up to 250 J/mm{sup}2, caused the Alclad layer to fuse together with the substrate.
机译：通过CO {Sub} 2-激光束弯曲的一组铝合金Alciad 2024-T3微观结构的光学和SEM显微照片显示出作为该激光的结果发生的变化诱导过程。使用的激光弯曲变量是：功率（p），扫描速度（v），光束直径（d）和通过的通差（n），所有它们排列成参数，（ns·p）/（d·v）被称为累积的能量密度（AED为j / mm {sup} 2）。对于低于25J / mm {sup} 2的AED值，材料的微观结构显示出底部区域中的子粒结构和不完全重结晶的小尺寸晶粒。较高的AED值，在25到133 j / mm {sup} 2之间，导致重结晶以完全进行，与接收材料的细长晶体结构对比。在该晶界处的分散体的AED范围分离以及先前重结晶晶粒的部分熔化。对于靠近133 j / mm {sup}的AED值2，在其无阿尔科拉德层下面的薄片的熔化和调节中，发生了留下蜂窝树枝状结构。 AED值范围从133到250 j / mm {sup} 2，导致无铝合金层与基板一起熔合。

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